Process of marking paper



H. W. A. DIXON PROCESS OF MARKING PAPER Fil ed May '7, 1827 A TTORNEYS.

Patented Oct. 28, 1930 UNITED STATES PATENT OFFICE HAROLD W. A. DIXON,OI HOLLIS, NEW YORK, ASSIG-NOR T0 COLUMBIA RIBBON 8c GARBONMANUFACTURING COMPANY,- INQ, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK PROCESS or MARKING Paras Application filed Kay 7 M inventionrelates to an improved process or the marking of papers, suchas carbonpapers.

In the manufacture of such papers, a supporting tissue or thin paper iscoated on one side with carbon ink, this ink being absorbed to a certainextent by the supporting tissue, so that the back thereof is darkened,to a degree dependent upon the absorbtive properties and the weight orthickness of the paper. It is an object of my invention to apply amarking to such paper by varying the amount of carbon ink which isabsorbed by the supporting tissue, so that the back of the sheet willpresent a mark, due to the variation in the ink absorbed, contrastin inappearance with the rest of the sheet. he process by which the desiredresults are obtained is, I believe, superior to the processes or methodsof marking now-employed.

Prior to my invention, mamfolding or carbon papers have been marked bapply-v ing printingink thereto, both be ore and after the carbon inkhas been applied, the visibility of the applied design or marking beingobtained by the pigment used in the -ink employed for printing thedesign or mark.-

'Another method employed previously is the application to the supportingpaper or tissue of a more or less colorless printing material, such asprinters varnish, in the form of the desired design or mark, thisvarnish rendering the area of the support ing tissue to which the sameis applied impervious to the carbon ink, the printed Sui"- aceorvarnished surface therefore presenting a different appearance from theremainder of the sheet.

In the practice of my invention, instead of applying the marking. ordesign. with printers ink and relying upon the pigment in the printersink for visibility, or instead ofemploying a printers varnish or similarmaterial which renders the paper or tissue impervious to the carbon ink,I do not change the permeability of the paper, but lessenthe penetratingqualities of the carbon ink at the mark-receiving portion of the paperor tissue, so that the amount of ink which pene- 1927. Serial No.188,747.

trates to the back of the supporting tissue or paper will be -less thanthat penetrating the remainder of the paper, thereby to provide a designor mark greatly contrasting in appearance with the remainder of thepaper or tissue into which the ink has penetrated.

To lessen the penetrative qualities of the carbon ink, I apply thedesired design to the paper or tissue, with an alkali solution, such asa solution of ethyl or meth 1, alcohol and caustic soda or potash, and wen the carbon ink is applied to the tissue or paper so treated thepenetrating qualities of the ink will be reduced at the mark-receivingportion of the paper or tissue, due to the saponifying actissue-in fact,without changing the character of this supporting, paper or t1ssue atall I effect a change in the penetrating qualities of the carbon ink soas to produce on the finished sheet or surface a mark or designcontrasting in appearance to the remainder of I the sheet.

The material employed for lessening the penetrating qualities of thecarbon ink may be applied on either or both sides of the uncoateefi'ect, and the alka i solution may be applied either before or 'afterthe application of the ink, althou' h a more pronounced effect isproduced i of the ink.

In the'manufacture of carbon papers as now practised it is quite usualto employ a supporting tissue or paper which has been colored by thepaper manufacturer before the carbon ink is applied thereto. I find withsuch papers that upon the application of the alkali solution not onlyare the penetrating qualities of the ink altered, but the solutionbleaches the dye em loyed in dyein the original tissue, with t e resultthat I o tain a mark or design on the finished sheet which perhaps iseven more contrasting in appearapplied prior to the applicationsupporting aper or tissue with equal i ance than where a white paper isemployed for the supporting tissue.

In the accompanying drawings, Fig. 1 shows in perspective the first stepin the process of marking paper by my improved method; and Fig. 2 is asimilar view showing the finished sheet.

Referring to the drawings in detail, 1 designates a sheet of paper whichis to be converted into carbon paper and to have a mark applied thereto.The mark, which is shown at 2, is applied to the sheet 1 before thesheet has had its ink applied thereto by applying the desired mark ordesign with an alkali solution such as a solution of ethyl alcohol andcaustic soda or potash. As above noted this material has the property oflessening the penetrative qualities of the carbon ink and consequentlywhen the paper 1 receives its coating 3 of carbon ink which it .will beunderstood is applied to the entire surface of the sheet the presence ofthe alkali solution on the paper sheet reduces the penetrativc qualitiesof the ink where the mark or design is applied with the result. as willbe appreciated, that the mark will appear in the finished sheet in alighter shade than the main portion body or ground of the sheet.

\Yhile I have mentioned certain materials as being suitable for use inthe practice of my invention, it is to be understood that these examplesare illustrative and not definitive and that my invention comprehendsthe employment of any suitable material which will lessen thepenetrative qualities of the ink at the portion or area of the.supporting paper or tissue at which the contrasting design is to appear.I wish it to be understood that the expressions carbon ink and carbonpaper are to be interpreted in their generic sense. I wish it to beunderstood also that my process is not necessarily limited to applying amark or design to a mere limited area of the sheet, but may be appliedto the entire sheet, practically, in any desired design.

What I claim is:

1. The process of marking carbon paper, which process consists inapplying the desired mark to the supporting paper or tissue in an alkalisolution and thereafter coating the supporting paper or tissue withcarbon ink.

2. The process of marking carbon paper, which process consists inapplying the desired mark to a supporting paper or tissue in a materialcapable of saponifying the carbon ink at the mark-receiving portion ofthe paper or tissue, and thereafter coating said paper or tissue withcarbon ink.

3. In the process of marking carbon paper in which the carbon ink issupported or carrFed by a colored paper or tissue, the step whichconsists in applying the mark to the mark-receiving portion of the"supporting mark-receiving portion of the supporting paper in a materialcapable of chemically changin the color of the paper and chemi- 7 callyafl ecting the penetrating qualities of the carbon ink.

This sgecification signed this 5th day of May, 192

HAROLD. W. A. DIXON.

